#include <stdio.h>

int main() 
{
    int a=0, b=0, c=0;
    0 < a < 1000;
    0 < b < 1000;
    0 < c < 1000;
    

while  (scanf("%d %d %d", &a, &b, &c)!=EOF)
{
    if(a + b > c && a + c > b && b + c > a)
    {
        if(a == b && b == c)  
        {
            printf("Equilateral triangle!\n");
        }
        else if (a == b || a == c || b == c)
        {
            printf("Isosceles triangle!\n");  
        }
        else
        {
            printf("Ordinary triangle!\n");
        }
    }
    else 
    {
        printf("Not a triangle!\n");
    }
}  
    return 0;
}